Log Message:
Update ruby-mixlib-shellout to 2.0.1.

Release: 2.0.1
- add buffering to the child process status pipe to fix chef-client deadlocks
- fix timeouts on Windows

Release: 2.0.0
- remove LC_ALL=C default setting, consumers should now set this if they
  still need it.
- Change the minimum required version of Ruby to >= 1.9.3.

Release: 1.6.0
- Steven Proctor: Updated link to posix-spawn in README.md.
- Akshay Karle: Added the functionality to reflect $stderr when using
  live_stream.
- Tyler Cipriani: Fixed typos in the code.
- Max Lincoln: Support separate live stream for stderr.